Ancient Singidunum which comprised castrum, civil dwellings and necropolis was declared archaeological site-cultural monument with the Decision of Cultural Heritage Preservation Institute of Belgrade No.176/8 dated 30 June 1964.

Stone fortification of trapezoidal shape, measuring approximately 560m x 330m, on a hill above the confluence of the Sava and the Danube rivers was the headquarters of the legion IIII FLAVIAE.

Southeast necropolis is spreading from the Republic Square through Decanska street, Boulevard of King Alexander to the Technical Faculty and to the Monument to Vuk Karadzić, where the largest number of graves were found.

These findings confirmed that the site “Pionirski Park” was a part of the south - eastern necropolis of Ancient Singidunum, where the burial of the deceased was performed during the 3rd and 4th century AD.

Some of them were decorated with rabbit paw or cut resembling a Latin S, and many have the stamp LEG IIII FF indicating that the bricks were made in the local workshop of the Fourth Flavia legion that was stationed in Singidunum.